OSTEOLOGY OF BIRDS 



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of semiossified ligament. The fomi of sternum possessed by 

 Netta rufina is practically repeated in the genus Marila, as 

 for example M . a m e r i c a n a , M . v a 1 1 i s n e r i a , M . a f - 

 finis, and M . c o 1 1 a r i s , all of which I have examined. 

 In none of them, however, have I ever found the xiphoid notches 

 converted into foramina. We must, as I have already pointed 

 out above, turn to such a genus as Clangula to find this. 



Fig. j6 Pectoral asi'cct of the ?ternum of Clangula i s 1 a n d i c a . Natural 

 size. Drawn by the author from a specimen in his own collection, now in the New 

 York State JNIuseum 



Whether it be the case in Charito netta albeola I am not 

 prepared to say at this writing, as I have not the sternum of that 

 duck at hand, but I am inclined to believe that it will be found 

 to possess a sternum, as well as many other osteological characters, 

 similar to Clangula. 



H a r e 1 d a h y e m a 1 i s has a sternum very different from 

 this, and, in so far as my observations go, quite unlike that bone 

 as found in anv other American duck. As alreadv stated it reminds 



